CVE-2022-31214

high

Description

A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68. By crafting a bogus Firejail container that is accepted by the Firejail setuid-root program as a join target, a local attacker can enter an environment in which the Linux user namespace is still the initial user namespace, the NO_NEW_PRIVS prctl is not activated, and the entered mount namespace is under the attacker's control. In this way, the filesystem layout can be adjusted to gain root privileges through execution of available setuid-root binaries such as su or sudo.

References

https://www.openwall.com/lists/oss-security/2022/06/08/10

https://firejail.wordpress.com/download-2/release-notes/

https://www.debian.org/security/2022/dsa-5167

https://lists.debian.org/debian-lts-announce/2022/06/msg00023.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/SIBEBE3KFINMGJATBQQS7D2VQQ62ZVMF/

https://lists.fedoraproject.org/archives/list/[email protected]/message/6RZOTZ36RUSL6DOVHITY25ZYKWTG5HN3/

https://lists.fedoraproject.org/archives/list/[email protected]/message/KUZZ5M6LIBYRKTKGROXC47TDC3FRTGJF/

Details

Source: MITRE

Published: 2022-06-09

Updated: 2022-09-15

Type: CWE-269

Risk Information

CVSS v2

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH